A 20 metre-high ice cliff forming the edge of the Wilkins Ice shelf on the Antarctic Peninsula is seen from a plane

 
A 20 metre-high ice cliff forming the edge of the Wilkins Ice shelf on the Antarctic Peninsula is seen from a plane
A 20 metre-high ice cliff forming the edge of the Wilkins Ice shelf on the Antarctic Peninsula is seen from a plane January 18, 2009. The huge Antarctic ice shelf is on the brink of collapse with just a sliver of ice holding it in place, the latest victim of global warming that is altering maps of the frozen continent. REUTERS/Alister Doyle (ANTARCTICA)